host.conf - resolver configuration file
The file /etc/host.conf contains configuration information specific to
the resolver library. It should contain one configuration keyword per
line, followed by appropriate configuration information. The keywords
recognized are order, trim, multi, nospoof and reorder. Each keyword
is described seperately below.
order This keyword specifies how host lookups are to be performed. It
should be followed by one or more lookup methods, seperated by
commas. Valid methods are bind, hosts and nis.
trim This keyword may be listed more than once. Each time it should
be followed by a single domain name, with the leading dot. When
set, the resolv+ library will automatically trim the given
domain name from the end of any hostname resolved via DNS. This
is intended for use with local hosts and domains. (Related
note: trim will not affect host- names gathered via NIS or the
hosts file. Care should be taken to insure that the first hostname
for each entry in the hosts file is fully qualified or nonqualified,
as appropriate for the local installation.)
multi Valid values are on and off. If set to on, the resolv+ library
will return all valid addresses for a host that appears in the
/etc/hosts file, instead of only the first. This is off by
default, as it may cause a substantial performance loss at sites
with large hosts files.
nospoof
Valid values are on and off. If set to on, the resolv+ library
will attempt to prevent hostname spoofing to enhance the security
of rlogin and rsh. It works as follows: after performing a
host address lookup, resolv+ will perform a hostname lookup for
that address. If the two hostnames do not match, the query will
fail.
spoofalert
If this option is set to on and the nospoof option is also set,
resolv+ will log a warning of the error via the syslog facility.
The default value is off.
reorder
Valid values are on and off. If set to on, resolv+ will attempt
to reorder host addresses so that local addresses (i.e., on the
same subnet) are listed first when a gethostbyname(3) is performed.
Reordering is done for all lookup methods. The default
value is off.
/etc/host.conf
Resolver configuration file
/etc/resolv.conf
Resolver configuration file
/etc/hosts
Local hosts database
gethostbyname(3), hostname(7), resolv+(8), named(8)
Debian GNU/Linux 1997-01-02 HOST.CONF(5)
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